There are a lot of reasons that can happen. Generally it is called Dysphagia. That is not the disease it is the symptom. You need to have an upper endoscopy by a gastroenterologist. Happens to me a lot also. I was diagnosed with Eosinophilic Esophagitis. Its very rare and they will need to take a biopsy of the esophagus during the endoscopy. Anxiety and depression can also cause dysphagia.
Good Luck.